冷却斜槽法制备均质Al-Bi系难混溶合金  

Preparation of Homogeneous Al-Bi Immiscible Alloy by a Cooling Slope Method

作　　者：王同敏[1] 宋涛[1] 许菁菁[1] 蔡少武[1] 李军[1] 曹志强[1] 李廷举[1] 

机构地区：[1]大连理工大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2008年第8期578-580,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(505601003);教育部新世纪优秀人才支持计划资助项目(NCET-07-0137);辽宁省自然科学基金资助项目(20052176);教育部留学归国基金资助项目

摘　　要：高于互溶温度的难混溶合金流经一个冷却斜槽,最终被浇入水浴铜铸型,利用该冷却斜槽法成功制备了Al-Bi系均质难混溶合金,探讨了析出的富Bi液滴随金属熔体在斜槽上流动时的受力情况。结果表明,作用于富Bi液滴上的Ma-rangoni力、熔体粘滞力及熔体冲刷的力与重力相互作用并相互减弱抵消,大大降低了富Bi液滴的Stokes沉积和Marango-ni迁移运动,使得Al-Bi难混溶合金熔体在斜槽上不发生严重的宏观偏析。而且熔体从斜槽流过后,温度大为降低,在很大程度上降低了后续水浴铜铸型的冷却压力。The homogeneous immiscible Al-Bi alloy was successfully prepared by a cooling slope method in which immiscible alloy was heated over the miscible temperature and then poured into a water bathed copper mould. The acted force of precipitated Bi-rich phase was described during flowing with melt on cooling slope. The results indicate that the Marangoni force, melt drag force and melt flushing force as well as gravity which acted on the Bi-rich phase are acted each other, resulting in the great reduction of the Stokes sedimentation and the Marangoni displacement, which plays significantly positive role for the homogeneous distribution of immiscible Al-Bi in cooling slope. Meanwhile, the temperature of the Al-Bi melt can be remarkably decreased after flowing slope, obviously decreasing the cooling pressure of water bathed copper mould, which have the positive effects of preparation of homogeneous immiscible Al-Bi alloy also.

关 键 词：难混溶合金 Al-Bi合金 均质制备 冷却斜槽 

分 类 号：TG146.21[一般工业技术—材料科学与工程]